CVE-2026-8839 MapPress Maps for WordPress <= 2.96.6 - Unauthenticated Insecure Direct Object Reference via REST API Endpoints
Unauthenticated attackers can read sensitive map data, while authenticated users can modify or delete any map due to missing ownership checks in REST API endpoints.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8839?
CVE-2026-8839 is a medium-severity missing authorization vulnerability in chrisvrichardson MapPress Maps for WordPress, published on 6 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The MapPress Maps for WordPress plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in all versions up to, and including, 2.96.6. This is due to missing ownership verification in the REST API routes registered via `Mappress_Api::rest_api_init()`, where the GET `/wp-json/mapp/v1/maps/{mapid}` endpoint uses `'permission_callback' => '__return_true'` and the write endpoints (POST update, DELETE, PATCH mutate, POST clone, POST empty_trash) only check the generic `edit_posts` capability without confirming that the requester owns the targeted map — a gap that is not compensated at the model layer, as `Mappress_Map::get()`, `save()`, `delete()`, `mutate()`, and `empty_trash()` all operate on any caller-supplied map ID without an ownership check. This makes it possible for unauthenticated attackers to read sensitive map data — including POI titles, addresses, coordinates, and body content — for any map on the site by enumerating map IDs, and for authenticated attackers with Contributor-level access and above to modify, delete, trash/restore, or clone any map regardless of its author.
Weakness: CWE-639
Which versions are affected by CVE-2026-8839?
How do I fix CVE-2026-8839?
No fix has been published for CVE-2026-8839 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-8839 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8839 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-4m8c-59q5-hc8f.